Vacuum booster check valve

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by backlash, May 13, 2001.

  1. backlash

    backlash 1/2 ton status

    Oct 21, 2000
    Likes Received:
    Northern, VA.
    Thanks for the info in the past, but want to try something else.

    I know the check valve can be tested, but don't have acccess to my tools.

    When I turn off the motor and pull the check valve out of the booster ... I just about get sucked in ... Ok a little exageration. But quite a bit of suction there.

    If I turn the motor off and leave it over night, there is still some vacuum there, but far less.

    Question: How air tight should that be? Will it leak down any? Seems to me that I do have a bad check valve.

    PS- Anyone replace a vacuum booster with a GM brand, not aftermarket? The parts guy said it comes with a booster check valve. Reason I ask ... I had the dealer replace the booster and the check valve on it now is the original.

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